LiftMaster K76-38057 575V Heater Kit — SL585505U / SL585105U

The LiftMaster K76-38057 is the 575V heater service kit specifically identified for SL585505U and SL585105U slide gate operators. Match the full model and electrical configuration before selecting it. A heater reference for these 575V models is separate from the standard HTRNB or 480V HTR460 options and does not establish a universal cold-weather accessory for every SL585 installation. Select the replacement by the complete part number and the installed equipment configuration. A similar photograph or a shared LiftMaster brand name does not establish interchangeability. Confirm the applicable service drawing before ordering so the repair addresses the correct component and its related mounting, connection and operating requirements.

Compatibility — Models, Versions and Exclusions

Identify the Assembly and Plan the Repair

The heater must match the operator’s electrical arrangement and approved mounting location. Have qualified personnel identify the installed supply and exact accessory circuit before ordering. Do not connect a heater to a guessed terminal or infer its power consumption, switching temperature or required wiring solely from the voltage in the part title.

Cold-weather symptoms may also involve gate resistance, lubrication, supply condition or damage elsewhere in the operator. A heater cannot repair those faults or make every operating temperature acceptable. Confirm the current kit, control provisions and installation instructions, keeping clearances from wiring and moving components as prescribed by the manufacturer.

An electrical symptom does not identify the failed component by itself. Have qualified service personnel inspect the supply, wiring, connections and equipment condition before replacing parts. Record existing labels and terminal references with power safely isolated. A replacement should restore the documented circuit arrangement; it should not be used to change operating voltage, defeat a protective function or compensate for a mechanical load that the equipment cannot safely move.

Specifications and Product Identification

Before Ordering

• Read the full operator model and supply nameplate.
• Verify the 575V K76-38057 application.
• Confirm current kit contents and approved mounting requirements.
• Inspect the cause of cold-weather problems before replacement.

Package Contents and Separate Requirements

This offer identifies the 575V heater service kit. Confirm the current heater, control, bracket and wiring pieces supplied; no unverified wattage or thermostat setting is claimed. A complete operator, replacement supply system and unrelated weather-protection components are not established as included.

Safety Warnings — Read Before Installation or Service

• WARNING: Electrical service can expose hazardous voltage and moving equipment. Use qualified service personnel and electrical personnel where required.
• Disconnect every applicable mains, battery and auxiliary supply before work. Follow the equipment instructions for stored energy and safe isolation.
• Verify the exact 575V heater circuit and approved clearances before connection. Do not apply another supply voltage or route wiring against hot surfaces or moving equipment.
• Restore covers and wiring protection, then complete the model-specific functional and safety checks before returning the installation to normal use.

Related Products and Important Differences

• CPS-U monitored photo eyes — separate protection devices for approved commercial-door controls; match the operator and environment.
• TDC12X1BMC MAXUM trolley operator — a complete-operator comparison, not evidence that this legacy service part fits MAXUM.

Frequently Asked Questions

Can I use a 480V heater instead?

Do not substitute by appearance or similar model name. Use the approved voltage and exact service reference.

Is it listed for SL585505U and SL585105U?

Yes. Those full models are identified in the researched manufacturer parts information.

Will it fix a gate that binds in cold weather?

Not by itself. Have the moving gate and operator condition diagnosed and repaired as needed.

Are wattage and thermostat settings specified here?

No unverified values are claimed. Obtain the current heater specification and exact installation instructions.

Need Help Confirming the Right Product?

Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.